Like this site? Help us to make it better.


PNW Components Coast Stem



Very tidy and cost-effective way to get more handlebar mount space on your bike – plus it's a stem
Removable GoPro-style mount
Five sizes
Subtle looks
Weight saving over separate mount
Lifetime warranty

At every product is thoroughly tested for as long as it takes to get a proper insight into how well it works. Our reviewers are experienced cyclists that we trust to be objective. While we strive to ensure that opinions expressed are backed up by facts, reviews are by their nature an informed opinion, not a definitive verdict. We don't intentionally try to break anything (except locks) but we do try to look for weak points in any design. The overall score is not just an average of the other scores: it reflects both a product's function and value – with value determined by how a product compares with items of similar spec, quality, and price.

What the scores mean

Good scores are more common than bad, because fortunately good products are more common than bad.

  • Exceptional
  • Excellent
  • Very Good
  • Good
  • Quite good
  • Average
  • Not so good
  • Poor
  • Bad
  • Appalling

The PNW Components Coast Stem is the perfect accompaniment to the super-wide Coast Bar, but it's also a good stem in its own right, with a really nifty adjustable mount and a lifetime warranty.

Stems must be the hardest bike thing to review. Lumps of metal that are easily overengineered to basically never fail, and being inherently light there's little to be gained shaving a few more grams using carbon or other exotic materials. So, aside from not making it look silly, how does a bike brand make its offer attractive to the market?

In the case of Seattle's PNW Components, once the basics were sorted ('Seven-degree rise do? Five lengths, yeah?') the answer was to help clean up your bars.

Space saving

PNW designs stuff to be ridden long and in pretty places, so it's likely you'll be needing lights at some stage, or maybe a camera. Add in a bike computer and maybe a phone (quiet, you purists) already on the bar, and that's a fair jumble of stuff. Yes, you can go for out-front mounts from the likes of Quadlock to put things above/below, but they take up space themselves on the bar, and cost a pretty penny.

Plenty of stem manufacturers and accessory brands do mounts that get held on by the stem's bolts – I have a small box of them, accumulated over the years. None of them look pretty and they all cost money. So to declutter things, PNW has integrated a removable GoPro-style mount into the faceplate of the stem itself. And made it easily adjustable with a 3mm hex.

2021 PNW Components Coast stem mounted.JPG

The result is simple and beautifully executed. A threaded alloy nut sits behind the stem faceplate, with a section of thread protruding slightly. Think of how a two-bolt SPD cleat bolts into a shoe – the threaded nut in your shoe can move back and forth in the same manner.

Adjusting the mount

The mount itself is a strong plastic, with the usual three prongs of the GoPro design. Set into the mount pointing at the stem/nut is a 3mm hex bolt, which you thread partly in, then adjust the angle of the mount up/down to suit. With the faceplate done up to torque you get about 45 degrees of movement up/down; if you loosen the stem bolts slightly you get about 100 degrees – more than enough to get your accessory clearances right – just remember to re-torque them once done. The back of the nut is curved to match the stem, and you have to get the orientation right or it won't move at all.

Once you have the angle right and the mount secure, an included 3mm hex nut/bolt will secure your GoPro-style mount of choice.

2021 PNW Components Coast Stem mounted 3.JPG

This sounds complicated but it's so intuitive there are no instructions needed. And if you don't want it, the mount and nut are easily removed.

2021 PNW Components Coast Stem 3.jpg

As mentioned, PNW recommends pairing the Coast stem with the mega-wide 480 or 520mm Coast bar. Therefore, it offers the Coast stem starting at a very short 60mm option, maxing out at 100mm. The wisdom is for every 20mm you go wider, you need a 10mm-shorter stem to keep upper body geometry tidy. For me, running the Coast 480mm bar, I'm down to an 80mm stem – despite having a 6ft 4in armspan (yes, yes, insert monkey noises here) and a typical 58cm/L-XL frame size.


Value-wise, yes it's £10 more than the Easton EA70 that Matt liked, but it's lighter and has a mount. It's £20-30 more than you could bag any one of a dozen generic stems for, although they are almost certainly going to weigh more, and also won't have mounts – which would also weigh north of 50-60g if you had to add one.

2021 PNW Components Coast Stem 2.jpg

What price you put on the adjustable mount, and on matching any PNW bar, is the question. The Coast stem is also mountain biking rated according to PNW's website, so if you want to use it on a flat-bar bike, go ahead.

> How to buy the best bike camera – and seven of the best

As mentioned in my review of the Coast bar, PNW is, I believe, the first bike component manufacturer to offer a lifetime warranty on its entire range of alloy components, usually reserved for high-end carbon components. As with the bar, the T&Cs exclude normal wear and tear as well as impact damage, as you'd expect, and again – how exactly you calculate 'normal wear and tear' on an alloy stem I'm not sure, so you should be good forever basically.

I believe every cyclist will at some stage find a use for the mount, and therefore combining the cost, the functionality and the warranty, along with the looks, the Coast stem represents pretty darn good value. If you really needed a mount but couldn't physically fit one, maybe on a maxed-out accessory setup with a narrow bar, it could be the answer to your Fettling prayers.

> Buyer’s Guide: The best front lights for cycling

It's a brave new world this allroad-gravel gig, and brands like PNW are delivering the well-priced goods needed to make it fun and functional. In the Coast Stem it has an affordable, attractive, functional component that will look good on pretty much any bike, to get your stuff off the bar.


Very tidy and cost-effective way to get more handlebar mount space on your bike – plus it's a stem test report

Make and model: PNW Components Coast Stem

Size tested: 60, 70, 80, 90, 100mm lengths

Tell us what the product is for and who it's aimed at. What do the manufacturers say about it? How does that compare to your own feelings about it?

It's for people wanting more stem mount options in a minimalist, easily removable way, matching their other PNW accessories.

PNW says:


When designing the Coast Stem we had two main goals: construct it to compliment the Coast Drop Bar and provide riders with an extra mount option for their gadgets.


Get that footie or take a nighttime pedal. Each Coast Stem comes with a detachable mount compatible with many headlamp options, GoPros and other POV cameras.


The shorter stem, in tandem with a comfortable 7° rise, places your body in an ideal position for comfort while remaining aggressive.

Tell us some more about the technical aspects of the product?



60mm, 70mm, 80mm, 90mm, 100mm




60mm - 111g / 70mm -117g / 80mm - 123g / 90mm - 129g / 100mm - 136g




Is there an option without the GoPro/light mount?

The short answer is no but the mount is easily removable if you don't want to use it!

Can I use the Coast Stem for mountain biking?

Yep! It's rated for mountain biking and is a great option for cross country bikes.

Which length is best for me?

Stem length is a heavily debated topic, and really comes down to personal preference. The key is to feel comfortable in the cockpit. If you are pairing this with the Coast Handlebar we recommend going down 10mm-20mm in stem length for every 20mm increase in bar width.


PNW lifetime Warranty

Rate the product for quality of construction:

Very nicely made from quality materials and nicely finished.

Rate the product for performance:

It's stiff and holds the mount rock-solid.

Rate the product for durability:

It has a lifetime warranty, too.

Rate the product for weight (if applicable)

It's at the lighter end of the spectrum for a mid-priced stem.

Rate the product for comfort (if applicable)

The 7-degree rise is a sweet spot for most riders, giving a relaxed upright position.

Rate the product for value:

Compared to buying a stem and mount separately, it's great value.

Tell us how the product performed overall when used for its designed purpose

Can't fault it.

Tell us what you particularly liked about the product

The mount, obvs.

Tell us what you particularly disliked about the product


How does the price compare to that of similar products in the market, including ones recently tested on

It's at the more expensive end of the market just for a stem, but when you factor in you're getting an integrated mount as well, it's almost a bargain! And it has a lifetime warranty.

Did you enjoy using the product? Yes

Would you consider buying the product? Yes

Would you recommend the product to a friend? Yes

Use this box to explain your overall score

Yes it's £60, but you're getting a lightish stem with a mount that would otherwise cost you £30 while adding weight, plus it looks great and has a lifetime warranty.

Overall rating: 9/10

About the tester

Age: 47  Height: 183cm  Weight: 77kg

I usually ride: Sonder Camino Gravelaxe  My best bike is: Nah bro that's it

I've been riding for: Over 20 years  I ride: A few times a week  I would class myself as: Expert

I regularly do the following types of riding: cyclo cross, general fitness riding, mtb, G-R-A-V-E-L

Living in the Highlands, Mike is constantly finding innovative and usually cold/wet ways to accelerate the degradation of cycling kit. At his happiest in a warm workshop holding an anodised tool of high repute, Mike's been taking bikes apart and (mostly) putting them back together for forty years. With a day job in global IT (he's not completely sure what that means either) and having run a boutique cycle service business on the side for a decade, bikes are his escape into the practical and life-changing for his customers.

Add new comment


Fluffed | 3 years ago

That chimney stack is something else!

Secret_squirrel | 3 years ago

Having just a single mount option is a bit pants really.  It really needs a top and bottom mount - Garmin/Computer on top and GoPro underneath.

Nice idea but I dont think it beats a £5-10 "ebay special" dual out in front mount.  I have one thats done sterling duty - the only complaint I have is that you cant get a Lezyne GPS insert for it so I have to use an iffy 3-d printed adaptor.


Latest Comments